Pumps – Motor driven – Fluid motor
Patent
1976-03-16
1977-06-14
Croyle, Carlton R.
Pumps
Motor driven
Fluid motor
91305, F04B 1700, F04B 3500
Patent
active
040294404
ABSTRACT:
A pressure intensifying apparatus to deliver a very high pressure stream of water through a nozzle. There is a single working piston having two pressure surfaces of a relatively large area, the working piston being connected to two high pressure pistons each having a pressure surface of a relatively small area. A control valve delivers a high pressure working fluid alternately to opposite sides of the working piston to cause it to reciprocate so that the pressure pistons alternately deliver water at high pressure to the nozzle. In shifting between its two end positions, the control valve passes through an intermediate position at which a restricted flow passage is provided for the working fluid, this restricted flow passage having an effective cross sectional area relative to the effective area of the largest size discharge nozzle used with the intensifier, such that the back pressure of the restricted passage of the control valve does not substantially exceed the back pressure exerted on the working fluid so that substantial pressure spikes are not imposed on the high pressure source of working fluid. In another configuration, the control valve in its intermediate position is also provided with a restricted flow passage leading from the then pressurized working chamber to the pump low pressure return line, thus alleviating potential pressure surges from the fluid in the pressurized working chamber. Further, in one embodiment there is a valve shifting mechanism comprising two shifting valves, each of which is responsive not only to physical contact by the working piston, but also to pressurization of its related working chamber to cause rapid shifting of the control valve. In another embodiment, there is a valve shifting mechanism comprising a shifting valve operably connected to said working piston through flexible actuating cables and arranged to direct fluid under pressure to opposite sides of the control valve alternately to move the control valve between its two end positions.
REFERENCES:
patent: 2942584 (1960-06-01), Rethmeier
patent: 3070023 (1962-12-01), Glasgow
Croyle Carlton R.
Flow Industries, Inc.
Hughes Robert B.
LaPointe G. P.
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